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T: Fachverband Teilchenphysik

T 5: Experimentelle Methoden: Tracking und Flavour-Tagging

T 5.8: Talk

Monday, March 9, 2015, 15:45–16:00, L.09.21 (HS 13)

Developement of a B-flavor tagging algorithm for the Belle II experiment — •Fernando Abudinen¹, Moritz Gelb², and Luigi Li Gioi¹ — ¹Max-Planck-Institut für Physik München — ²Karlsruher Institut für Technologie

The high luminosity SuperB-factory SuperKEKB will allow a precision measurement of the time-dependent CP violation parameters in the B-meson system. The analysis requires the reconstruction of one of the two exclusively produced neutral B mesons to a CP eigenstate and the determination of the flavor of the other one. Because of the high amount of decay possibilities, full reconstruction of the tagging B is not feasible. Consequently, inclusive methods that utilize flavor specific signatures of B decays are employed.
The algorithm is based on multivariate methods and follows the approach adopted by BaBar. It proceeds in three steps: the track level, where the most probable target track is selected for each decay category; the event level, where the flavor specific signatures of the selected targets are analyzed; and the combiner, where the results of all categories are combined into the final output. The framework has been completed reaching a tagging efficiency of ca. 25%. A comprehensive optimization is being launched in order to increase the efficiency. This includes studies on the categories, the method-specific parameters and the kinematic variables. An overview of the algorithm will be presented together with the results at the current status.